(05-21) 16:42 PDT SAN JOSE -- A construction worker fell to his death at a San Jose work site Wednesday, one day after a 54-year-old Fairfield man died the same way in San Mateo, authorities said.

San Jose police responded to reports of a fall near the intersection of Sierra Road and North Capitol Avenue at 12:08 p.m., officials said.

The man had apparently fallen about three stories while he was unloading sheetrock, according to Cal/OSHA, the state's workplace safety regulator. He was pronounced dead at the scene. His identity was not immediately released.

On Tuesday, Elias Bedolla Vera died while working at the top of a wall at a construction site for the Bay Meadows housing development on the 2900 block of McCown Avenue in San Mateo.

Greg Siggins, a spokesman for Cal/OSHA, said he fell about nine feet just before 3:40 p.m. He was pronounced dead at the scene.

Cal/OSHA is conducting an investigation in both cases, Siggins said.

Vera worked for Conco, a large concrete company headquartered in Concord. The firm has been investigated by Cal/OSHA eight times since 2008 for accidents at sites throughout the state. The company was cited 15 times for these accidents, records show.

A Conco spokeswoman said company officials did not have any more information about Tuesday's incident, but she said their hearts went out to Vera's family.

The worker who died in San Jose worked for FBM Construction, Siggins said.

"At this time, they're both just open investigations," he said. "The investigations can take up to six months by statute, so it will be a couple of months before we know whether or not citations will be issued."